一步置换法制备AgPd纳米粒子及催化性能研究  

Preparation of AgPd nanoparticles by one-step displacement method and their catalytic properties

作　　者：刘军[1] 周全[1] 吴新华[1] 刘久逢 易容 李容[1] LIU Jun;ZHOU Quan;WU Xin-hua;LIU Jiu-feng;YI Rong;LI Rong(Department of Pharmaceutical and Biological Engineering,Hunan Chemical Vocational Technology College,Zhuzhou 412000,China)

机构地区：[1]湖南化工职业技术学院,制药与生物工程学院,湖南株洲412000

出　　处：《化学研究与应用》2022年第8期1761-1769,共9页Chemical Research and Application

基　　金：湖南省教育厅科学研究课题(20C0685)资助。

摘　　要：在室温条件下,以聚乙烯吡咯烷酮(PVP)为稳定剂,以Mg粉为还原剂,采用一步置换法制备出AgPd和Pd纳米粒子。通过透射电子显微镜(TEM)、X射线衍射(XRD)以及X-射线光电子能谱(XPS)等对该AgPd和Pd纳米粒子的属性进行了表征。结果表明,AgPd和Pd纳米粒子为单分散状态且能长时间的稳定存在。采用不同摩尔比(3∶1,1∶1或1∶3)的金属离子前驱体Ag^+和Pd^(2+),均可制备出单分散的AgPd纳米粒子。PVP对AgPd和Pd纳米粒子的稳定存在起关键作用。所制备的AgPd纳米粒子对4-硝基苯酚的还原表现出优异的催化活性,其催化效率顺序为:Ag_(1)Pd_(1)>Pd>Ag_(3)Pd_(1)>Ag_(1)Pd_(3)。Ag_(1)Pd_(1)纳米粒子循环使用5次后,其催化活性没有显著降低。The AgPd and Pd nanoparticles were prepared by one-step displacement method at room temperature.Herein,we used polyvinylpyrrolidone(PVP)as stabilizer and Mg powder as reducing agent.Characterization techniques such as transmission electron microscopy(TEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were employed to verify the nature of the AgPd and Pd nanoparticles.The results showed that as-synthesized nanoparticles were well-dispersed and stable for a long time.Monodisperse AgPd nanoparticles with different composition can be prepared by using metal ion precursors with different molar ratios(3:1,1:1 or 1:3).PVP played a key role in the stable existence of AgPd and Pd nanoparticles.The as-synthesized materials presented excellent activities toward the reduction of 4-nitrophenol under ambient conditions.The catalytic efficiency of as-obtained nanoparticles takes the following order:Ag_(1)Pd_(1)>Pd>Ag_(3)Pd_(1)>Ag_(1)Pd_(3).Ag_(1)Pd_(1) was reusable for five consecutive cycles without a significant loss in its catalytic activity.

关 键 词：置换反应 双金属纳米催化剂 AgPd纳米粒子 对硝基苯酚的还原 

分 类 号：O614.1[理学—无机化学]